Special Investigator is a 1936 RKO Radio Pictures American crime-drama film, starring Richard Dix and featuring Margaret Callahan, Erik Rhodes and Owen Davis, Jr.

[2] Bill Fenwick (Richard Dix) is a criminal defense attorney who's near the top of his career, wealthy from defending gangsters and getting them off.

When he learns from Inspector Perkett (Russell Hicks) that his brother was killed during an attempted mob rub-out of a witness who could tie a half a million in stolen gold bullion to notorious racketeer Edward J. Selton (J. Carroll Naish), he quits his practice to find the man who ordered the hit.

He suspects it may be a front for camouflaging the half a million in stolen bullion in with newly mined unproductive ore, a known mob gambit.

In Quartzburg, Selton's sister Virginia (Margaret Callahan) arrives to take care of her brother, who was wounded in the shootout that killed George, but the rest of the gang is suspicious of her.

Bill contrives to meet Virginia when she stops for gas and, unaware that she is the Selton's sister but knowing that she's connected in some way to the mine, follows her to Reno, where she picks up a shady doctor, Vic Reynolds (Jed Prouty), at the airport.

Learning that the government is planning a raid at midnight, Bill takes Virginia dancing in Reno to keep her out of harm's way, but two suspicious members of the gang follow them there.

Bill learns from Judy that the gang knows his real identity, and joins up with the Justice Department agents heading out to raid the ranch.